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#ifndef nsMemoryImpl_h__
#define nsMemoryImpl_h__

#include "nsIMemory.h"
#include "prlock.h"
#include "plevent.h"

// nsMemoryImpl is a static object. We can do this because it doesn't have
// a constructor/destructor or any instance members. Please don't add
// instance member variables, only static member variables.

class nsMemoryImpl : public nsIMemory
{
public:
    // We don't use the generic macros because we are a special static object
    NS_IMETHOD QueryInterface(REFNSIID aIID, void** aResult);
    NS_IMETHOD_(nsrefcnt) AddRef(void) { return 1; }
    NS_IMETHOD_(nsrefcnt) Release(void) { return 1; }

    NS_DECL_NSIMEMORY

    static NS_HIDDEN_(nsresult) Startup();
    static NS_HIDDEN_(void)     Shutdown();
    static NS_METHOD Create(nsISupports* outer,
                            const nsIID& aIID, void **aResult);

    NS_HIDDEN_(nsresult) FlushMemory(const PRUnichar* aReason, PRBool aImmediate);

protected:
    struct FlushEvent {
        PLEvent mEvent;
        const PRUnichar* mReason;
    };

    NS_HIDDEN_(nsresult) RunFlushers(const PRUnichar* aReason);
    static NS_HIDDEN_(void*) PR_CALLBACK HandleFlushEvent(PLEvent* aEvent);
    static NS_HIDDEN_(void)  PR_CALLBACK DestroyFlushEvent(PLEvent* aEvent);

    static PRLock* sFlushLock;
    static PRBool  sIsFlushing;

    static FlushEvent sFlushEvent;
};

#endif // nsMemoryImpl_h__